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—This paper presents a new analytical method for predicting magnetic field distribution and levitation force in three configurations of high temperature superconducting (HTSC) maglev vehicles. The permanent magnet guideways (PMG) are composed with ferromagnetic materials and NdFeB permanent magnets. The proposed analytical model is based on the resolution(More)
This paper presents the steps of the approach to identify the linear parameters of a salient-pole synchronous machine at standstill and by frequency response tests data (SSFR). It is currently established and demonstrated that stability parameters for synchronous machines can be obtained by performing frequency response tests with the machine at standstill.(More)
—This paper deals with the prediction of magnetic field distribution and electromagnetic performances of parallel double excitation and spoke-type permanent magnet (PM) motors using simplified (SM) and exact (EM) analytical models. The simplified analytical model corresponds to a simplified geometry of the studied machines where the rotor and stator(More)
The paper examines the dynamic performances of a three-phase self-excited induction generator (SEIG) during sudden connection of static loads. A dynamic flux model of the SEIG in the ˺-˻ axis stationary reference frame is presented. The main flux saturation effect in the SEIG is accounted for by using an accurate technique. The cases of purely resistive,(More)
This paper presents , the stator current minimization in an induction machine controlled by the oriented flux method. This minimization is realized by two different methods, a dynamic programming and the optimization in permanent operating regime. Flux in the machine is no more constant as it is the case in the conventional vectorial control, but it evolves(More)
The rotor circuit time constant is an important parameter for indirect field oriented control. Incorrect estimation of the rotor time constant also leads to incorrect flux angle calculations and can cause significant performance deterioration if no means for compensation or identification is applied. The magnetic saturation, the operating temperature and(More)
The main goal of this paper is to develop a method permitting to determine the nature of the rotor defects thanks to the spectral analysis. The development growing that the equipment of measurement (spectral analyzer) and the software of digital signal processing had made possible the diagnosis of the electric machine defects. Motor current signature(More)
In this paper a method of detection of broken bars in squirrel cage induction machine is presented. This method is based on the determination of discrete parameters of the transfer functions of the induction machine by model structures such as ARMAX, ARX, IV and OE model structures